Jasienski M, Ayala F J, Bazzaz F A
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, U.S.A.
Heredity (Edinb). 1997 Feb;78 ( Pt 2):176-81. doi: 10.1038/hdy.1997.25.
When measured directly, rather than inferred from pedigree analyses, the relationship between similarity in phenotype and similarity in DNA sequence was detectable at the level of members of a single population and strongly depended on the environmental context. Genetic divergence among 27 co-occurring genotypes of Abutilon theophrasti, a common annual plant, was less than 5 per cent as revealed by RAPD-PCR analysis based on over 400 bands per genotype. Nevertheless, within this narrow range, there was a positive correlation between genetic similarity and similarity in the performance of genotypes on temperature and moisture gradients, suggesting that plasticity itself has a genetic basis. No relationship was detected, however, when the phenotypic plasticity was expressed in response to gradients of light intensity or soil fertilization, indicating a weaker genetic basis, or suggesting possible involvement of a few genes of major effect.
当直接测量而非从谱系分析推断时，在单一种群成员层面可检测到表型相似性与DNA序列相似性之间的关系，且这种关系强烈依赖于环境背景。苘麻是一种常见的一年生植物，通过基于每个基因型400多条条带的RAPD-PCR分析发现，27种共生基因型之间的遗传差异小于5%。然而，在这个狭窄范围内，遗传相似性与基因型在温度和湿度梯度上表现的相似性之间存在正相关，这表明可塑性本身具有遗传基础。但是，当表型可塑性表现为对光照强度或土壤施肥梯度的响应时，未检测到相关性，这表明遗传基础较弱，或者暗示可能涉及少数具有主要效应的基因。
